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Changing the Battery in Your Mazda 3 Key Fob

It is frustrating to drive off at the conclusion of a long and tiring day and discover that your key fob is dead. Fortunately, this is an easy fix with a simple battery replacement from the hardware store or big box retailer.

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Battery Replacement

Removing the battery from the Mazda 3 key fob is a simple process that you can perform at home. However, you should replace the battery if it goes out of service, or if the key fob displays a message on the multi-information display, "Low key fob battery. Replace battery."

To open the key fob case you'll need a tape-wrapped flathead screwdriver as well as some patience. Locate a notch or gap in the bottom of the metal part of the mazda key copy 3's key fob, and then insert the tip of the screwdriver to cut off the lower half. Repeat the procedure for the top piece of metal however, be careful not to damage the rubber ring on the bottom of the case.

You'll find a slot on each side of the fob case, which houses the battery. Use the flathead screwdriver with tape to gently pry open the case, beginning at one end and moving to the other. Take out the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct direction of polarity. Attach the cap to the battery again, and then attach both sides of your key fob case by pressing until they click.

Now that you've replaced the battery Check the fob to verify that it works by locking and unlocking your doors. If everything appears to be working then you can begin using the Mazda 3's remote functions to drive again!

Pairing Issues

If your key fob stops working all of a sudden it could mean that the transmitter inside the car has been damaged. It is usually a job to a professional and you will require a new key fob.

If you've tried replacing the battery and programming the key fob but isn't solving the issue it is possible that the chip in the key fob may be defective. This could happen if the keyfob was dropped or exposed to saltwater or was touched by dirty fingers.

You will need to locate the small "key", which is built into the seam, to take off the circuit board to identify the issue. You can then examine the chip for damage or corrosion. It is recommended to clean the paper towel to avoid damaging the microchip.

You may also examine the battery connector's terminals to examine if they're cracked or broken. If this is the case, then carefully attaching them back can generally restore the functionality of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loose, they can easily be re-soldered as well unless the button is actually snapped off.

Interference Signals

There are few things more difficult than trying to start your vehicle and getting the message "No Fob Detected". This usually occurs at the most inconvenient times, such as when you're running late for work or if you're picking up kids from daycare/school. There are several things you can try to figure out what's causing the problem.

Interference signals can cause the remote key fob to stop working in a proper manner. This could be caused by objects like buildings, weather conditions, and transmitters that operate on the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

The key fob can also be damaged if it is exposed to water or salty water. Water can damage the rubber seals of the electronic chip particularly in the event that the key fob is submerged in water for an extended time. The chip may stop working and may require replacement of the keyfob. If you have a programable key cleaning the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does not help, the chip is likely to be damaged and needs to be replaced.

Locking or Unlocking the Doors

The buttons on the key fob transmit electronic signals to the solenoid of the car, which then converts this signal into mechanical action. This locks and unlocks doors. If the door lock isn't working, the issue could be a solenoid issue that requires some analysis with the help of an expert repair shop for autos.

A dead 12 volt battery can also prevent the fob from functioning properly. This could happen if the battery is unable to charge or if the contactors are corroded and stop transmitting electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes.

The receiver module could be the cause if the key fob isn't working after replacing the battery or program the device. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. If it breaks down, it can be expensive to repair.

To verify if this is true, place your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice in a matter of 10 seconds without removing it. The Mazda 3 system will now be able to synchronize the key with your vehicle and you can then use it as your primary remote for driving. This lets you program up to three keys.